Wouldn't you need do sudo since you are in root /Library ?

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Not if you are an admin user. You would need root power to write /System/Library.

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Correcting myself somewhat.

As is implied in the hint, you can write to /Library/Preferences as an admin user without using root.

Writing to directly to /Library, however, requires root power, as that folder is read-only for admin users (most of the subfolders are writable by the admin group, though).

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Actually I think this is the correct situation:
If the user has created the launchd file through the System Prefs sharing panel, than you'll need sudo to rm it. But if it's disabled in System Prefs, than yes, you can run the command as admin only, as you have write access to the Preferences folder.

In short, you have write access to the folder as an admin but not to the file created by the System Pref.

Great tip by the way!

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Not if you're logged in as root :-)

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